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Polyglycolic acid resin short fibers and well treatment fluid

a polyglycolic acid resin and well treatment fluid technology, applied in the direction of well accessories, sealing/packing, chemistry apparatus and processes, etc., can solve the problems that the well is also sometimes needed to repair, and achieve excellent hydrolyzability and biodegradability, excellent proppant dispersibility, and the ability to sufficiently secure the pressure of the fracturing fluid

Inactive Publication Date: 2015-05-07
KUREHA KAGAKU KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides PGA short fibers with excellent strength and degradability, which can be used as a degradable material in well treatment fluids such as drilling fluids, fracturing fluids, cementing fluids, temporary plug fluids, and completion fluids. The PGA short fibers have a mass loss of at least 10% after 14 days in water at a temperature of 60°C, and a pH of 1 to 5 after 3 days in water at a temperature of 60°C with a solid content concentration of 2 mass%. The PGA short fibers have an outside diameter of 1 to 120 μm, a fiber length of 2 to 30 mm, and a fineness of 0.1 to 25 D. The PGA short fibers have excellent properties such as excellent proppant dispersibility, sufficient pressure of the fracturing fluid, and excellent hydrolyzability and biodegradability. The well treatment fluid containing the PGA short fibers has excellent properties such as easy retrieval, disposal, and biodegradability.

Problems solved by technology

In addition, the repair of the well is also sometimes necessary due to changes over time.
However, in these prior art documents, many resin materials are listed as degradable materials, an extremely large number of types of shapes and sizes are disclosed for the particles or fibers to be formed from the degradable materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

working example 1

[0087]PGA (manufactured by Kureha Corporation, weight average molecular weight (Mw): 180,000; molecular weight distribution (Mw / Mn): 2.0; melting point (Tm): 218° C.; glass transition temperature (Tg): 42° C.; melt viscosity (measured at a temperature of 240° C. and a shear rate of 122 sec−1): 790 Pa·s; terminal carboxyl group concentration: 3.8 eq / 106 g; also called “PGA 1” hereafter) pellets were fed to an extruder and melted at a temperature of 250° C., and fibers were spun and wound from a spinneret having fine holes with a nozzle diameter of 0.4 mm. Next, after being drawn to three times the length in a liquid bath at a temperature of 60° C., the drawn yarn was cut to a fiber length of 6.0 mm to obtain PGA short fibers with an outside diameter of 11 μm. The results of measurements of the outside diameter, fiber length, fineness, and strength of these short fibers are as shown in Table 1. In addition, the results of evaluating the hydrolyzability (mass loss and pH) and proppant ...

working example 2

[0088]PGA short fibers with an outside diameter of 12 μm were obtained in the same manner as in Working Example 1 with the exception of cutting the drawn yarn to a fiber length of 3.4 mm. The results of measurements of the outside diameter, fiber length, fineness, and strength of these short fibers are as shown in Table 1. In addition, the results of evaluating the hydrolyzability (mass loss and pH) and proppant dispersibility of the obtained short fibers are shown in Table 1.

working example 3

[0089]PGA short fibers with an outside diameter of 11 μm were obtained in the same manner as in Working Example 1 with the exception of cutting the drawn yarn to a fiber length of 9.2 mm. The results of measurements of the outside diameter, fiber length, fineness, and strength of these short fibers are as shown in Table 1. In addition, the results of evaluating the hydrolyzability (mass loss and pH) and proppant dispersibility of the obtained short fibers are shown in Table 1.

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Abstract

PGA short fibers having the following characteristics of (a) to (c): (a) strength of 1 to 20 gf / D; (b) a mass loss of at least 10% after 14 days in water at a temperature of 60° C.; and (c) a pH of 1 to 5 after 3 days in water at a temperature of 60° C. with a solid content concentration of 2 mass %. The PGA short fibers preferably further having (d1) an outside diameter of 1 to 120 μm, (e1) a fiber length of 2 to 30 mm, and (f1) a fineness of 0.1 to 25 D, or the PGA short fibers preferably further having (d2) an outside diameter of 1 to 200 μm, (e2) a fiber length of less than 2 mm, and (f2) an aspect ratio of 2 to 1,200. Also, a well treatment fluid containing the PGA short fibers.

Description

TECHNICAL FIELD[0001]The present invention relates to polyglycolic acid resin short fibers that can be used for a well treatment fluid used in the drilling of petroleum, gas, or the like.BACKGROUND ART[0002]In recent years, there has been an increasing need to drill wells for extracting petroleum, gas, water, hot water, hot springs, or the like from the earth or for surveying water quality (collectively called “wells” hereafter) in order to secure energy resources or protect the environment. In order to drill a well such as an oil well, for example, with an apparatus for digging a well, i.e. a well-digging apparatus, drilling is generally performed up to a prescribed depth from the earth's surface, and a steel pipe called a casing is laid therein so as to prevent the collapse of the wall. The well is dug further underground from the end of the casing to form a deeper well, and a new casing is laid through the inside of the casing laid previously. The diameter of the casing is adjust...

Claims

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Application Information

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IPC IPC(8): C09K8/12C09K8/80C09K8/44C09K8/70C09K8/42
CPCC09K8/12C09K8/70C09K2208/08C09K8/44C09K8/80C09K8/426C04B16/0683C04B28/02C04B2103/0073C09K8/035C09K8/487C09K8/5086C09K8/516C09K8/68C09K8/885C09K8/92D01F6/625
Inventor ABE, SHUNSUKEYAMAZAKI, MASAHIROTAKAHASHI, TAKEOSUZUKI, KENICHISATO, HIROYUKI
Owner KUREHA KAGAKU KOGYO KK